The correct answer is D.
Evidence: “But there was no silence; all the time the motor omnibuses were turning their wheels and changing their gear; like a vast nest of Chinese boxes all of wrought steel turning ceaselessly one within another the city murmured;”
Explanation: This line highlights the bustling activity of the city during the time period, emphasizing the noise and movement of motor omnibuses. The personification is evident in the way the city is described as "murmuring," which conveys the idea that the city itself is alive and active. The historical context of motor vehicles being a relatively new invention at that time adds a layer of significance to the description, as it contrasts with the natural setting of the garden and enhances the overall atmosphere of vivid life and movement.